"For the past few years Tay and I have always gone to her favorite steakhouse! It’s special to her because it’s a 'me and her only' dinner spot," El Moussa wrote. "This time she asked me if we could bring @heatherraeyoung and my heart melted."

"After more than 3 years on my own I’m so PROUD to say that this beautiful, sweet and talented young lady is my girlfriend!" El Moussa, 38, captioned an Instagram photo of Young, 32, kissing his cheek.